On new-ish playgrounds, the “ropes” are a sheathed in fiber/nylon, but there is typically steel cable in the center to reduce stretching (stretching being a com

On new-ish playgrounds, the “ropes” are a sheathed in fiber/nylon, but there is typically steel cable in the center to reduce stretching (stretching being a common safety issue for various reasons). I learned this after making a poorly considered leap playing with my son and scraping the ever living hell out of my shins/causing a bone bruise. The sheath also increases grip relative to (painted) steel bars.